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Disclosery

AMPH AMPHASTAR PHARMACEUTICALS IN

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COM (common), issuer CIK 1297184

206 managers (215 13F filers) reported a position in AMPH shares at 2026-03-31, 32,346,864 shares in all. 21 filers opened a position and 45 filers sold out during the quarter.

Managers
206
13F filers
215
New
21
Added
69
Reduced
95
Sold out
45
Shares held by filers
32,346,864

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
BlackRock, Inc.in group BlackRock, Inc.5,421,343$106M<0.01%-40,67213F-HRTimelineGroup
VANGUARD GROUP INCgroup of 8 filers holding2,655,473$52M+2,645,011Timeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP2,027,947$39.7M0.01%+228,26213F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP1,607,515$31.5M<0.01%+75,72913F-HRTimelineGroup
TD Asset Management Inc1,541,044$30.2M0.02%-422,00813F-HRTimeline
FULLER & THALER ASSET MANAGEMENT, INC.1,395,139$27.3M0.09%+67613F-HRTimeline
MARSHALL WACE, LLPin group MARSHALL WACE, LLP1,025,640$20.1M0.02%-211,64413F-HRTimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC1,017,538$19.9M0.01%+352,20213F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC976,650$19.1M<0.01%+89,82513F-HRTimelineGroup
Boston Trust Walden Corpin group Boston Trust Walden Corp944,789$18.5M0.15%-142,47713F-HRTimelineGroup
Epoch Investment Partners, Inc.898,895$17.6M0.11%-227,69013F-HRTimeline
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.665,542$13M0.01%+108,47613F-HRTimelineGroup
LSV ASSET MANAGEMENT651,714$12.8M0.03%+541,41413F-HRTimeline
Invesco Ltd.in group Invesco Ltd.604,774$11.8M<0.01%+103,37013F-HRTimelineGroup
RENAISSANCE TECHNOLOGIES LLC553,900$10.9M0.02%+9,20013F-HRTimeline
UBS Group AGgroup of 2 filers holding475,638$9.32M+163,782Timeline
SYSTEMATIC FINANCIAL MANAGEMENT LP452,898$8.87M0.2%+17,31813F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY420,337$8.23M<0.01%-171,29413F-HRTimelineGroup
ROYCE & ASSOCIATES LP406,175$7.96M0.08%+53,87813F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP372,279$7.29M<0.01%+88813F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC371,373$7.28M0.01%+80,70013F-HRTimelineGroup
Bridge City Capital, LLC335,105$6.56M1.82%+99,62013F-HRTimeline
BRIDGEWAY CAPITAL MANAGEMENT, LLC330,457$6.47M0.13%+6,90813F-HRTimeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC329,388$6.45M<0.01%-227,32113F-HRTimelineGroup
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPin group ARROWSTREET CAPITAL, LIMITED …325,291$6.37M<0.01%-234,13513F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co321,039$6.29M<0.01%-29,66813F-HRTimelineGroup
DENALI ADVISORS LLC266,465$5.22M0.58%+54,70013F-HRTimeline
Pacer Advisors, Inc.261,483$5.12M0.01%+83,73913F-HR/ATimeline
VICTORY CAPITAL MANAGEMENT INC249,617$4.89M<0.01%-55,54413F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp243,226$4.76M<0.01%-15,83513F-HRTimelineGroup
PRINCIPAL FINANCIAL GROUP INCin group PRINCIPAL FINANCIAL GROUP INC209,131$4.1M<0.01%-8,84313F-HRTimelineGroup
RICE HALL JAMES & ASSOCIATES, LLC187,348$3.67M0.2%+66,17213F-HRTimeline
Empowered Funds, LLC181,332$3.55M0.02%+15,42513F-HR/ATimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/174,323$3.41M<0.01%+46,14913F-HRTimelineGroup
VOLORIDGE INVESTMENT MANAGEMENT, LLC171,188$3.35M0.01%-60,11713F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS156,077$3.06M<0.01%+35,18413F-HRTimelineGroup
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP150,591$2.95M<0.01%+10,28113F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND148,722$2.91M<0.01%+22,75413F-HRTimeline
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …139,402$2.73M<0.01%+110,29813F-HRTimelineGroup
FRANKLIN RESOURCES INCin group Franklin Resources139,305$2.73M<0.01%+113,26013F-HRTimelineGroup
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP138,148$2.71M<0.01%+39,47013F-HRTimelineGroup
LAM GROUP, INC.130,800$2.56M1.41%013F-HRTimeline
Public Sector Pension Investment Board126,574$2.48M0.01%+4,06913F-HRTimeline
NORDEA INVESTMENT MANAGEMENT ABin group NORDEA INVESTMENT MANAGEMENT …123,824$2.42M<0.01%-5,32013F-HRTimelineGroup
BESSEMER GROUP INCin group BESSEMER GROUP INC122,046$2.39M<0.01%+1,15613F-HRTimelineGroup
O'SHAUGHNESSY ASSET MANAGEMENT, LLC103,929$2.04M0.01%+16,74613F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO104,574$2.01M<0.01%-54,07013F-HR/ATimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC92,475$1.81M<0.01%-125,06213F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd87,736$1.72M0.03%+39,12913F-HRTimelineGroup
RHUMBLINE ADVISERS83,721$1.64M<0.01%+1,33113F-HRTimeline
EXCHANGE TRADED CONCEPTS, LLC82,416$1.61M0.01%+72,99813F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc80,916$1.59M<0.01%-9,81413F-HRTimelineGroup
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC78,778$1.54M<0.01%+11,12613F-HRTimelineGroup
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC78,775$1.54M<0.01%-54,94013F-HR/ATimelineGroup
ALLIANCEBERNSTEIN L.P.56,430$1.51M<0.01%-4,20013F-HRTimeline
Nuveen, LLCin group TIAA76,595$1.5M<0.01%+49413F-HRTimelineGroup
Swiss National Bank72,600$1.42M<0.01%013F-HRTimeline
Robeco Institutional Asset Management B…in group Robeco Institutional Asset Ma…66,407$1.3M<0.01%new13F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC65,540$1.28M<0.01%-163,18413F-HRTimelineGroup
HUSSMAN STRATEGIC ADVISORS, INC.63,000$1.23M0.27%new13F-HRTimeline
ALGERT GLOBAL LLC62,360$1.22M0.02%-62,77013F-HR/ATimeline
HRT FINANCIAL LP56,181$1.1M<0.01%new13F-HRTimeline
ASSETMARK, INCin group ASSETMARK, INC53,738$1.05M<0.01%-62113F-HRTimelineGroup
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC50,693$993K<0.01%+3,49013F-HRTimelineGroup
SteelPeak Wealth, LLC48,462$949K0.03%-7,23313F-HRTimeline
Trexquant Investment LP47,867$938K0.01%-65,80613F-HRTimeline
PRICE T ROWE ASSOCIATES INC /MD/44,903$880K<0.01%+8,10713F-HRTimeline
Polaris Capital Management, LLC43,232$847K0.07%+7,70013F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN42,019$823K<0.01%-3,28313F-HR/ATimelineGroup
HSBC HOLDINGS PLCin group HSBC HOLDINGS PLC38,017$753K<0.01%new13F-HRTimelineGroup
Man Group plcin group Man Group plc37,274$730K<0.01%+23,12313F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC35,904$703K<0.01%+7,62413F-HRTimelineGroup
Legato Capital Management LLC34,135$669K0.06%+7,54513F-HRTimeline
SEGALL BRYANT & HAMILL, LLC33,318$653K0.01%+22,13313F-HR/ATimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\33,131$649K<0.01%+3,57413F-HRTimelineGroup
SG Americas Securities, LLC32,806$643K<0.01%-60,70913F-HRTimeline
SummerHaven Investment Management, LLC32,633$639K0.39%-5,56713F-HRTimeline
Quadrature Capital Ltdin group Quadrature Capital Ltd30,561$599K0.01%new13F-HRTimelineGroup
CANADA LIFE ASSURANCE Coin group CANADA LIFE ASSURANCE Co30,216$593K<0.01%013F-HRTimelineGroup
Freestone Grove Partners LP29,857$585K<0.01%+2,26413F-HRTimeline
Squarepoint Ops LLCin group Squarepoint Ops LLC28,345$555K<0.01%+13,48513F-HRTimelineGroup
CALIFORNIA STATE TEACHERS RETIREMENT SY…28,299$554K<0.01%-7,49913F-HRTimeline
Illumine Investment Management, LLC28,078$550K0.42%-25013F-HRTimeline
State of Alaska, Department of Revenue27,410$536K0.01%-50613F-HRTimeline
Advisor OS, LLCin group Advisor OS, LLC25,405$498K0.04%013F-HRTimelineGroup
ADVISORY RESEARCH INC25,335$496K0.06%+10,17413F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC24,207$474K<0.01%-39,02513F-HRTimeline
Thrivent Financial for Lutheransin group Thrivent Financial for Luther…23,618$463K<0.01%-69513F-HRTimelineGroup
Vident Advisory, LLCin group Vident Advisory, LLC23,244$455K<0.01%+2,83513F-HRTimelineGroup
NEW YORK STATE TEACHERS RETIREMENT SYST…21,825$428K<0.01%-1,15213F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC21,283$417K<0.01%-54,03613F-HRTimelineGroup
MetLife Investment Management, LLCin group MetLife Investment Management…20,761$407K<0.01%-31413F-HRTimelineGroup
Round Rock Advisors LLC20,495$401K0.06%+1813F-HRTimeline
Illinois Municipal Retirement Fund19,528$383K<0.01%-1,38513F-HRTimeline
Mirae Asset Global Investments Co., Ltd.group of 2 filers holding19,212$376K+100Timeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC19,055$373K<0.01%-65,39913F-HRTimelineGroup
Verition Fund Management LLC18,597$364K<0.01%new13F-HRTimeline
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC18,268$358K<0.01%-10,55513F-HRTimelineGroup
nVerses Capital, LLC17,685$346K0.31%new13F-HRTimeline
STATE OF WISCONSIN INVESTMENT BOARD17,388$341K<0.01%-11813F-HRTimeline
JANUS HENDERSON GROUP PLCin group Janus Henderson16,868$331K<0.01%013F-HR/ATimelineGroup
Creative Planningin group Creative Planning16,403$321K<0.01%-35,26113F-HRTimelineGroup
CANADA PENSION PLAN INVESTMENT BOARD16,300$319K<0.01%-13,50013F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …15,879$311K<0.01%-52313F-HRTimelineGroup
Louisiana State Employees Retirement Sy…15,700$308K0.01%-50013F-HRTimeline
Assenagon Asset Management S.A.15,216$298K<0.01%013F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPgroup of 2 filers holding14,601$286K-60,501Timeline
FEDERATED HERMES, INC.in group FEDERATED HERMES, INC.14,079$276K<0.01%-9,45813F-HRTimelineGroup
Janney Montgomery Scott LLC13,817$271K<0.01%-41313F-HRTimeline
Quantedge Capital Pte Ltd13,500$264K0.14%-78,20013F-HRTimeline
HOHIMER WEALTH MANAGEMENT, LLC13,066$256K0.03%new13F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.13,040$255K<0.01%+18613F-HRTimelineGroup
State of New Jersey Common Pension Fund…in group State of New Jersey Common Pe…12,564$246K<0.01%new13F-HRTimelineGroup
MML INVESTORS SERVICES, LLC12,367$242K<0.01%-2,29413F-HRTimeline
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…11,614$228K<0.01%-8,85113F-HRTimelineGroup
NATIXIS ADVISORS, LLCin group Natixis Investment Managers11,510$225K<0.01%new13F-HRTimelineGroup
PDT Partners, LLC11,441$224K0.01%new13F-HRTimeline
Magnetar Financial LLCin group Magnetar Financial LLC11,235$220K<0.01%new13F-HRTimelineGroup
Vestcor Inc10,949$214K0.01%-5,43413F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…10,913$214K<0.01%013F-HRTimeline
PROFUND ADVISORS LLC10,658$209K0.01%-46313F-HRTimeline
Sterling Capital Management LLC10,385$203K<0.01%-6,21713F-HRTimeline
Police & Firemen's Retirement System of…10,263$201K<0.01%013F-HRTimeline
AMALGAMATED BANK10,215$200K<0.01%-20413F-HRTimeline
ARIZONA STATE RETIREMENT SYSTEM10,098$198K<0.01%-33013F-HRTimeline
TEACHERS RETIREMENT SYSTEM OF THE STATE…9,053$178K<0.01%013F-HRTimeline
FIFTH THIRD BANCORPin group FIFTH THIRD BANK, NATIONAL AS…8,750$171K<0.01%+8,24113F-HRTimelineGroup
State of Tennessee, Department of Treas…8,619$169K<0.01%013F-HRTimeline
China Universal Asset Management Co., L…8,051$158K0.01%+56313F-HRTimeline
OREGON PUBLIC EMPLOYEES RETIREMENT FUND8,042$158K<0.01%-10013F-HRTimeline
KLP KAPITALFORVALTNING AS7,900$155K<0.01%013F-HRTimeline
Zurcher Kantonalbank (Zurich Cantonalba…7,783$152K<0.01%+27913F-HRTimeline
Corient Private Wealth LPgroup of 2 filers holding6,670$131K-8,669Timeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…5,449$107K<0.01%-35913F-HRTimelineGroup
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION…5,265$103K<0.01%013F-HRTimeline
Basecamp Wealth Advisors LLC4,356$85.3K0.02%-3213F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…3,918$76.8K<0.01%+2,13113F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA3,523$68K<0.01%-5,74213F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…3,445$67.5K<0.01%-28413F-HRTimelineGroup
Ameritas Investment Partners, Inc.group of 2 filers holding3,101$60.7K-9,186Timeline
CX Institutional2,973$58K<0.01%-61,15013F-HRTimeline
TD PRIVATE CLIENT WEALTH LLC2,379$46.6K<0.01%-3913F-HRTimeline
HANTZ FINANCIAL SERVICES, INC.2,027$40K<0.01%-2,45713F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
Blue Trust, Inc.1,607$31.5K<0.01%+36713F-HRTimeline
FMR LLCin group FMR LLC1,294$25.4K<0.01%-2,22913F-HRTimelineGroup
Farther Finance Advisors, LLC1,136$23K<0.01%-24513F-HRTimeline
QUADRANT CAPITAL GROUP LLC1,131$22.2K<0.01%-1,60313F-HR/ATimeline
GF FUND MANAGEMENT CO. LTD.1,024$20.1K<0.01%+12213F-HRTimeline
1620 INVESTMENT ADVISORS, INC.718$14.1K0.01%013F-HRTimeline
CWM, LLCin group CWM, LLC658$12.9K<0.01%-1,02513F-HRTimelineGroup
Parallel Advisors, LLC657$12.9K<0.01%+58913F-HR/ATimeline
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF O…589$11.5K<0.01%+8113F-HRTimeline
SIGNATUREFD, LLC588$11.5K<0.01%+4613F-HRTimeline
HARBOR CAPITAL ADVISORS, INC.391$8K<0.01%+12013F-HRTimeline
BNP PARIBAS ASSET MANAGEMENT Holding S.…in group BNP PARIBAS ASSET MANAGEMENT …396$7.76K<0.01%-3,36613F-HRTimelineGroup
MAI Capital Management371$7.27K<0.01%+1313F-HRTimeline
NISA INVESTMENT ADVISORS, LLC361$7.07K<0.01%-25913F-HRTimeline
GAMMA Investing LLC339$6.64K<0.01%-1,34613F-HRTimeline
US BANCORP \DE\in group US BANCORP \DE\318$6.23K<0.01%-48813F-HRTimelineGroup
Pinnacle Wealth Planning Services, Inc.283$5.54K<0.01%-1,33213F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP288$5.47K<0.01%-24313F-HRTimelineGroup
Smartleaf Asset Management LLC273$5.25K<0.01%+1413F-HRTimeline
SIMPLEX TRADING, LLC262$5.13K<0.01%new13F-HRTimeline
MassMutual Private Wealth & Trust, FSB224$4.39K<0.01%-54313F-HRTimeline
Versant Capital Management, Inc218$4.27K<0.01%-14413F-HRTimeline
LOS ANGELES CAPITAL MANAGEMENT LLC217$4.25K<0.01%-19,18013F-HRTimeline
GROUP ONE TRADING LLC214$4.19K<0.01%-1,52713F-HRTimeline
Spire Wealth Managementin group Spire Wealth Management206$4.04K<0.01%-713F-HRTimelineGroup
Bank of New Hampshire206$4.04K<0.01%new13F-HRTimeline
UMB Bank, n.a.180$3.53K<0.01%-7013F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
TWIN PEAKS WEALTH ADVISORS, LLC177$3.47K<0.01%new13F-HRTimeline
Parkside Financial Bank & Trust156$3.06K<0.01%-1713F-HRTimeline
Capital Advisors, Ltd. LLC170$3K<0.01%+15913F-HRTimeline
City State Bank150$2.94K<0.01%013F-HRTimeline
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…124$2.43K<0.01%+2413F-HRTimelineGroup
Essential Partners LLC121$2.37K<0.01%-7913F-HRTimeline
CoreCap Advisors, LLC107$2.1K<0.01%013F-HRTimeline
MCF Advisors LLC100$1.96K<0.01%new13F-HRTimeline
Steward Partners Investment Advisory, L…100$1.96K<0.01%new13F-HRTimeline
Truvestments Capital LLC96$1.88K<0.01%-5813F-HRTimeline
Arax Advisory Partners60$1.69K<0.01%+2713F-HRTimeline
IFP Advisors, Inc70$1.37K<0.01%-90013F-HRTimeline
WealthCollab, LLC64$1.25K<0.01%013F-HRTimeline
HighMark Wealth Management LLC55$1.08K<0.01%013F-HRTimeline
Covestor Ltd37$1K<0.01%-2213F-HRTimeline
Bare Financial Services, Inc46$901<0.01%new13F-HRTimeline
SBI Securities Co., Ltd.44$862<0.01%+113F-HRTimeline
Allworth Financial LP43$843<0.01%-1,44313F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.28$549<0.01%-3613F-HR/ATimelineGroup
BROWN, LISLE/CUMMINGS, INC.27$529<0.01%new13F-HRTimeline
FARMERS & MERCHANTS INVESTMENTS INCin group FARMERS & MERCHANTS INVESTMEN…25$490<0.01%013F-HRTimelineGroup
PICTON MAHONEY ASSET MANAGEMENT24$470<0.01%013F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…24$470<0.01%-6613F-HR/ATimelineGroup
Sound Income Strategies, LLC23$466<0.01%new13F-HRTimeline
Legacy Wealth Managment, LLC/IDin group Legacy Wealth Managment, LLC/…21$412<0.01%-3813F-HRTimelineGroup
Larson Financial Group LLC20$392<0.01%-74813F-HRTimeline
Trust Co15$294<0.01%013F-HRTimeline
Torren Management, LLC15$294<0.01%-74713F-HRTimeline
Sunbelt Securities, Inc.14$274<0.01%-813F-HRTimeline
Owl Creek Wealth Partners LLC10$196<0.01%13F-HRTimeline